bjoernager/rust
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Simplify arg capacity calculations.

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Currently they try to be very precise. But they are wrong, i.e. they
don't match what's happening in the loop below. This code isn't hot
enough for it to matter that much.
This commit is contained in:
Nicholas Nethercote 2022-08-26 10:37:51 +10:00
parent b75b3b3afe
commit feeaa4db3c
2 changed files with 5 additions and 24 deletions
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7
compiler/rustc_codegen_llvm/src/abi.rs
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@ -328,12 +328,9 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
let args =
if self.c_variadic { &self.args[..self.fixed_count as usize] } else { &self.args };
let args_capacity: usize = args.iter().map(|arg|
if arg.pad.is_some() { 1 } else { 0 } +
if let PassMode::Pair(_, _) = arg.mode { 2 } else { 1 }
).sum();
// This capacity calculation is approximate.
let mut llargument_tys = Vec::with_capacity(
if let PassMode::Indirect { .. } = self.ret.mode { 1 } else { 0 } + args_capacity,
self.args.len() + if let PassMode::Indirect { .. } = self.ret.mode { 1 } else { 0 },
);
let llreturn_ty = match &self.ret.mode {